Image display device with optical systems to guide light to a pupil

ABSTRACT

An image display device with which it is possible to visually recognize an image while securing the see-through property regardless of eye movements and changes in interpupillary distance, with which it is possible to display a large-size image with high quality, and which is small, has excellent wearability, and has an excellent external appearance.

This is a Continuation of application Ser. No. 15/514,627 filed Mar. 27,2017, which in turn is a National Phase of International PatentApplication No. PCT/JP2015/004747 filed Sep. 17, 2015, which claimspriority to Japanese Patent Application No. 2014-203701 filed Oct. 2,2014. The disclosures of the prior applications are hereby incorporatedby reference herein in their entireties. The present invention relatesto an image display device.

TECHNICAL FIELD Background Art

In recent years, an image display device which is used in a state ofbeing worn on a head portion of a viewer such as a head mounted displayis provided as a wearable information device. For example, PTL 1 whichis described below discloses a video display device which is providedwith a light source, a display element which modulates light from thelight source and displays a video, and a viewing optical system whichguides the video light from the display element to a pupil of theviewer. In the video display device, a holographic optical element isdisposed in front of the eyes of the viewer, and the holographic opticalelement transmits light from the outdoor scenes. Accordingly, the vieweris capable of visually recognizing an image of the outdoor scenes inaddition to a video from the display element. An image display devicewith which it is possible to visually recognize both a video from adisplay element and an image of the outdoor scenes may also be referredto as a see-through type image display device hereinafter. In the videodisplay device, since only the holographic optical element has anoptical power, it is difficult to correct aberration and distortionwhich are caused by the holographic optical element. Therefore, it isdifficult to display an image with a wide angle of view at a highresolution, that is, an image of a large size.

In PTL 1, a liquid crystal display element is given as an example of thedisplay element; however, in a case in which a device which has atwo-dimensional external shape such as a liquid crystal display elementis used, there is a problem in that the size of the display elementbecomes great. In order to reduce the size of the display element, PTLs2 and 3 which are described below disclose an image display device whichis provided with scanning means for driving a mirror totwo-dimensionally scan light. However, in the device of PTL 2, in a casein which the diameter of the laser beam to be scanned is narrow, thereis a problem in that the laser beam shifts from the position of thepupil when the eye is moved, and the image becomes invisible.Additionally, since the interval between the right eye and the left eye,the so-called interpupillary distance differs depending on the person,there is a problem in that when the user changes, the image becomesinvisible.

On the other hand, PTL 3 discloses an image display device in whichlight deflecting means is provided in a light emission region of a lightguide plate which guides scanned light to the front of an eye, and animage is visible even if the eye moves due to spreading the image lightover the entirety of the light emission region and emitting the imagelight. Hereinafter, a function of magnifying the exit pupil by spreadingthe image light in this manner will be referred to as a pupil magnifyingfunction. However, in the device of PTL 3, since the light guiding platealso stretches outside of the region in front of the eyes of the viewerwhich is necessary for the image display and the light guiding plateoverhangs the side of the face, the device increases in size, and thisis not preferable from the standpoint of external appearance.

PTL 4 discloses a video display device which includes a pupil magnifyingfunction in a case in which an ocular optical system is formed of amirror which is disposed in front of the eye. Specifically, in the videodisplay device, a diffraction grating is disposed between a concavemirror and the eye, and the pupil magnifying function is exhibited bydividing the light which is reflected by the concave mirror intoplurality of pencils of rays. However, in this configuration, since thediffraction grating is displaced in front of the eyes of the viewer, thesee-through property is impaired.

CITATION LIST Patent Literature

-   PTL 1: Japanese Unexamined Patent Application Publication No.    2012-13908-   PTL 2: International Publication No. 2009/041055-   PTL 3: Japanese Unexamined Patent Application Publication No.    2011-70141-   PTL 4: Japanese Unexamined Patent Application Publication No.    7-72422

SUMMARY OF INVENTION Technical Problem

As described above, in the image display devices of PTLs 1 to 4, thereare various problems in that it is difficult to display an image withhigh resolution and large size, the image becomes invisible due to eyemovement or a change in interpupillary distance, the image displaydevice becomes large which is not preferable from the standpoint ofexternal appearance, the see-through property is impaired, and the like.

An aspect of the invention is made in order to solve the problemsdescribed above, and an object thereof is to provide an image displaydevice with which it is possible to visually recognize an image whilesecuring a see-through property regardless of movement of an eye andchanged in interpupillary distance, with which it is possible to displayan image of a large size at high quality, and which is small and hasexcellent wearability and external appearance.

Solution to Problem

In order to achieve the object described above, an image display deviceof an aspect of the invention includes a light source optical systemwhich emits a light, a mirror which reflects the light which is emittedfrom the light source optical system, a light scanning device whichscans the light which is reflected by the mirror to use the light asimage light, a pupil magnifying optical system which magnifies a beamdiameter of the light which is emitted from the light scanning device, acorrecting optical system on which the light which is emitted from thepupil magnifying optical system is incident and which corrects shape andaberration of the image light, and a deflecting optical system whichdeflects the light which is emitted from the correcting optical systemto guide the light to a position of an exit pupil and transmits aportion of external light.

In the image display device of an aspect of the invention, image lightis generated by scanning light which is emitted from the light sourceoptical system using the light scanning device. Since the mirror whichreflects the light which is emitted from the light source optical systemis provided, the optical path between the light source optical systemand the light scanning device is turned back. Accordingly, it ispossible to reduce the size of the optical system which generates theimage, and the feel of wearing is excellent due to the center of gravityof the image display device being positioned at the rear side (the sidewhich is close to the ears of the viewer). Since the pupil magnifyingoptical system is positioned on the optical path between the lightscanning device and the correcting optical system, the pupil magnifyingoptical system may be configured so as not to be positioned in front ofthe eyes of the viewer. Accordingly, it is possible to secure asee-through property while having a pupil magnifying function which iscapable of reducing the influence of eye movement and interpupillarydistance fluctuation.

The diameter of the light which is incident on the deflecting opticalsystem is enlarged by the action of the pupil magnifying optical system.At this time, even if the design of the deflecting optical system isoptimized, the aberration and distortion may not be completely correctedusing the deflecting optical system alone, in particular, in a case inwhich the size of the image is large, that is, the angle of view islarge, the quality of the image may be reduced. In this regard, sincethe image display device of an aspect of the invention is provided withthe correcting optical system which corrects the shape and theaberration of the image light, the aberration and distortion which arecaused by the deflecting optical system, for example, are corrected, anda high-quality image may be obtained. In this manner, according to anaspect of the invention, it is possible to provide an image displaydevice with which it is possible to visually recognize an image whilesecuring a see-through property regardless of movement of an eye andchanges in interpupillary distance, with which it is possible to displayan image of a large size at high quality, and which is small and hasexcellent wearability and external appearance.

In the image display device of an aspect of the invention, thedeflecting optical system may be formed of a holographic mirror.

Even if the light is incident at a sufficiently large incidence angle,the holographic mirror is capable of reflecting the light to the frontside, and is capable of guiding the reflected light to the exit pupil.Therefore, by forming the deflecting optical system using theholographic mirror, it is possible to dispose the deflecting opticalsystem at an angle close to perpendicular in relation to the opticalaxis of the exit pupil, and it is possible to reduce the thickness ofthe part of the image display device which is positioned in front of theeye. As a result, it is possible to realize an image display device withan excellent external appearance.

In the image display device of an aspect of the invention, thecorrecting optical system may be provided with a plurality of lenses,and at least one lens among the plurality of lenses may have a wedgeshape in which a thicknesses on a side which is close to the exit pupilis thick, and a thicknesses of a side which is distant from the exitpupil is thin.

According to this configuration, it is possible to bend the optical axisof the correcting optical system in a direction which fits the headportion of the viewer. As a result, it is possible to dispose theoptical system of the entirety of the image display device so as to fitthe head portion, and it is possible to realize an image display devicewith an excellent external appearance and an excellent feel of wearing.

In the image display device of an aspect of the invention, across-sectional shape of the pupil magnifying optical system may be atrapezoid, and the pupil magnifying optical system may be disposed in anorientation such that of two sides which are disposed parallel to eachother in the trapezoid, a short side is positioned at a side which isclose to the exit pupil, and a long side is positioned at a side whichis distant from the exit pupil.

According to this configuration, it is possible to bend the optical axisof the optical system in a direction which fits the head portion of theviewer using the pupil magnifying optical system. As a result, it ispossible to realize an image display device with an excellent externalappearance and excellent feel of wearing.

In the image display device of an aspect of the invention, the mirrormay be disposed to be inclined such that an optical path of the lightwhich is incident from the light source optical system and is reflectedby the mirror is positioned on a side which is separated from the exitpupil in relation to an optical path of the light which is incident onthe mirror.

According to this configuration, it is possible to dispose the lightscanning device at a position which is further from the head portion ofthe viewer than the light source optical system. As a result, it ispossible to reduce the thickness of the portion of the image displaydevice which is positioned in the temporal region, and it is possible torealize an image display device with an excellent external appearanceand an excellent feel of wearing.

In the image display device of an aspect of the invention, the lightsource optical system may include a light source unit, an optical fiberwhich propagates the light from the light source unit, and a collimatorlens onto which the light which is emitted from the optical fiber isincident.

According to this configuration, it is possible to dispose the lightscanning device at a position which is further from the head portion ofthe viewer than the light source optical system. As a result, it ispossible to reduce the thickness of the portion of the image displaydevice which is positioned in the temporal region, and it is possible torealize an image display device with an excellent external appearanceand an excellent feel of wearing.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a state in which a user wears an imagedisplay device of an embodiment of the invention.

FIG. 2 is a perspective diagram of an entirety of the image displaydevice.

FIG. 3 is a plan view illustrating the configuration of the imagedisplay device.

FIG. 4 is a plan view illustrating the positional relationship ofportions of the image display device.

DESCRIPTION OF EMBODIMENTS

Hereinafter, description will be given of the embodiment of theinvention using FIGS. 1 to 4.

The image display device of the present embodiment is an example of ahead mounted display which a user wears on the head of the user to use.

In the following description, head mounted display (Head MountedDisplay) will be shortened to HMD.

FIG. 1 is a diagram illustrating a state in which the user wears the HMDof the present embodiment.

FIG. 2 is a perspective diagram of the HMD of the present embodiment.

The dimensions may be illustrated at different scales depending on theconfiguration element in order to render the configuration elementseasier to view in all of the following diagrams.

As illustrated in FIG. 1, an HMD 300 of the present embodiment is wornon the head portion and used by the user with the feeling of wearingeyeglasses. The HMD 300 of the present embodiment is a see-through type(transmitting type) HMD. According to the HMD 300 of the presentembodiment, the user is capable of visually recognizing an image whichis generated by an image display unit, and is also capable of visuallyrecognizing an image of the outdoor scenes such as the scenery which isexternal to the HMD 300.

As illustrated in FIG. 2, the HMD 300 is provided with a display device100 which has a shape which is similar to eyeglasses, and a controldevice (a controller) 200 which has a size of a degree a user may holdusing a hand of the user. The display device 100 and the control device200 are connected in a wired or a wireless manner to be capable ofcommunication. In the present embodiment, each of a left eye imagedisplay unit 110A and a right eye image display unit 110B which form thedisplay device 100, and the control device 200 are connected in a wiredmanner via a cable 150 to be capable of communication, and communicateimage signals, control signals, and the like.

The display device 100 is provided with a main frame 120, a sub-frame130, the left eye image display unit 110A, and the right eye imagedisplay unit 110B. The control device 200 is provided with a displayunit 210, and an operation button unit 250. The display unit 210displays various information, instructions, and the like to be providedto the user, for example. The main frame 120 is provided with a rimportion 121, and a pair of temple portions 122A and 122B for the user towear on the ears of the user. The sub-frame 130 is a member whichsupports the left eye image display unit 110A and the right eye imagedisplay unit 110B.

FIG. 3 is a plan view illustrating the configuration of the portions ofthe display device 100. FIG. 3 illustrates a state of the user wearingthe display device 100 as viewed from above the head.

The right eye image display unit 110B and the left eye image displayunit 110A have the same configuration, and the configuration elementsinside both the image display units are disposed to be left-rightsymmetrical. Therefore, hereinafter, detailed description will be givenof the right eye image display unit 110B simply as the image displayunit 110, and description of the left eye image display unit 110A willbe omitted.

As illustrated in FIG. 3, the image display unit 110 is provided with animage generating unit 11, a pupil magnifying optical system 12, acorrecting optical system 13, and a holographic mirror 14. The imagegenerating unit 11 emits light which includes image information. Thepupil magnifying optical system 12 magnifies the beam diameter of thelight which is emitted from a light scanning device 17 which isdescribed later. The light which is emitted from the pupil magnifyingoptical system 12 is incident on the correcting optical system 13, andthe shape and the aberration of a light image which includes imageinformation which is generated by the image generating unit 11 arecorrected. The holographic mirror 14 deflects the light which is emittedfrom the correcting optical system 13 to guide the light to the positionof an exit pupil G, and transmits a portion of external light.

The holographic mirror 14 of the present embodiment corresponds to adeflecting optical system of the claims.

The image generating unit 11 is provided with a light source opticalsystem 15, a mirror 16, and the light scanning device 17. The lightsource optical system 15 emits light which is generated by an internalsemiconductor laser. The mirror 16 reflects the light which is emittedfrom the light source optical system 15 and turns back the optical pathof the light. The light scanning device 17 scans the light which isreflected by the mirror 16.

The light source optical system 15 is provided with a light source unit25, a pickup lens 26, an optical fiber 27, and a collimator lens 28. Forexample, the light source unit 25 is provided with a plurality of solidstate light sources (not illustrated) including a semiconductor laserwhich emits red light, a semiconductor laser which emits green light,and a semiconductor laser which emits blue light. The colors of lightwhich are emitted from the semiconductor lasers are modulated accordingto the image signal, the colors of light which are modulated arecombined, and are emitted from the light source unit 25 as image light.The pickup lens 26 transmits the light which is emitted from the lightsource unit 25 to the optical fiber 27 of a later stage. The opticalfiber 27 guides the light, which passes from the light source unit 25,through the pickup lens 26, and is incident on the optical fiber 27, toan optical system of a later stage. The collimator lens 28 parallelizesthe light which is incident from the optical fiber 27.

The optical path of the light which is emitted from the light sourceoptical system 15 is turned back due to the light being reflected by themirror 16, and the light is guided to the light scanning device 17. Inthe case of the present embodiment, the mirror 16 is disposed to beinclined such that an optical path L2 of the light which is reflected bythe mirror 16 is positioned on a side which is separated from the exitpupil G in relation to an optical path L1 of the light which is incidenton the mirror 16. In other words, the mirror 16 is disposed to beinclined in an orientation at which a normal line V which extends fromthe reflecting surface extends in a direction distancing from the headportion H of the viewer. Accordingly, the optical path from the lightsource optical system 15 to the light scanning device 17 is turned backto a direction separating from a position close to the head portion H ofthe viewer.

The light scanning device 17 is provided with a MEMS mirror (notillustrated), for example. The light scanning device 17 causes theposture of the MEMS mirror to change according to a modulation operationof the light source optical system 15, and scans lighttwo-dimensionally. In this manner, the light scanning device 17 emitslight which includes image information.

The light which is emitted from the light scanning device 17 is incidenton the pupil magnifying optical system 12. The pupil magnifying opticalsystem 12 is provided with a plurality of parallel plates (notillustrated), and a plurality of half mirrors (not illustrated). Theplurality of parallel plates are bonded via the half mirrors. The pupilmagnifying optical system 12 are cut such that a pair of end surfacesare inclined in relation to the thickness direction of the parallelplates. The pair of end surfaces becomes a light entrance end surface 12a and a light exit end surface 12 b, respectively. In this manner, thehorizontal cross-sectional shape of the pupil magnifying optical system12 is trapezoidal. The pupil magnifying optical system 12 is disposed inan orientation such that of the two sides which are parallel to eachother in the trapezoid, the short side is positioned at the side whichis close to the exit pupil G, and the long side is positioned at theside which is distant from the exit pupil G.

In the pupil magnifying optical system 12, after the light which isincident from the light entrance end surface 12 a is repeatedlytransmitted and reflected by the plurality of half mirrors, the light isemitted from the light exit end surface 12 b. The width of the lightwhich is emitted from the light exit end surface 12 b is magnified withrespect to the width of the light which is incident on the lightentrance end surface 12 a. The incidence angle of the light on the lightentrance end surface 12 a and the emission angle of the light from thelight exit end surface 12 b match. Therefore, for example, the lightwhich is perpendicularly incident on the light entrance end surface 12 ais perpendicularly emitted from the light exit end surface 12 b, and thelight which is incident on the light entrance end surface 12 a at apredetermined incidence angle is emitted from the light exit end surface12 b at an emission angle which is equal to the incidence angle.Accordingly, when the light passes through the pupil magnifying opticalsystem 12, the optical path bends to the short side of the trapezoid.

The correcting optical system 13 is provided between the pupilmagnifying optical system 12 and the holographic mirror 14. The lightwhich is emitted from the pupil magnifying optical system 12 is incidenton the correcting optical system 13, and the correcting optical system13 corrects aberration and distortion of the image which occurs due tothe holographic mirror 14. The correcting optical system 13 is providedwith a first correcting lens 21, a second correcting lens 22, and athird correcting lens 23, in order from the light entrance side. In thepresent embodiment, the correcting optical system 13 is configured usingthree lenses of the first correcting lens 21, the second correcting lens22, and the third correcting lens 23; however, the number of correctinglenses is not particularly limited.

Among the three correcting lenses which form the correcting opticalsystem, the first correcting lens 21 and the third correcting lens 23have a wedge shape in which the thicknesses on the side which is closeto the exit pupil G (that is, the head portion H of the viewer) arethick, and the thicknesses of the side which is distant from the exitpupil G are thin. In the present embodiment, an example is given inwhich the two correcting lenses have the wedge shape; however, thenumber of correcting lenses having the wedge shape is not necessarilylimited to two, and at least one lens may have a wedge shape.

The holographic mirror 14 reflects the light which is emitted from thecorrecting optical system 13 toward the exit pupil G to generate animage, while transmitting a portion of the external light. Theholographic mirror 14 has a volumetric hologram, and it is possible toarbitrarily adjust the incidence angle and the reflection angle of thelight by changing the volumetric hologram pattern. Therefore, even ifthe holographic mirror 14 is disposed substantially in parallel with thefront surface of the face of the viewer, it is possible to guide thelight which is incident from the correcting optical system 13 at a largeincidence angle to the exit pupil, that is, to the pupil of the viewer.An intermediate image is generated on the optical path between thecorrecting optical system 13 and the holographic mirror 14.

FIG. 4 is a plan view illustrating the positional relationship ofportions of the display device 100.

As illustrated in FIG. 4, a tangential plane F which passes through acenter C1 of the holographic mirror 14 is assumed. The holographicmirror 14 is disposed such that an angle θ1 which is formed by anoptical axis AX1 of the exit pupil G and an axis AX2 which isperpendicular to the tangential plane F is less than or equal to 5°.Using this angle as a premise, the optical design between theholographic mirror 14 and the correcting optical system 13 is optimized.For example, when a general half mirror is used as the deflectingoptical system, it is necessary to incline the deflecting optical systemby 45° in relation to the optical axis AX1. To handle this, in the caseof the present embodiment, since it is possible to dispose theholographic mirror 14 at an angle which is close to perpendicular inrelation to the optical axis AX1 of the exit pupil G, it is possible toreduce the thickness of the image display unit 110 which is positionedin front of the eyes of the viewer.

A distance T1 from the exit pupil G to the center C1 of the holographicmirror 14 is set to be greater than or equal to 30 mm. Therefore, in astate in which the display device 100 is worn, the distance from thepupil of the viewer to the center C1 of the holographic mirror 14becomes greater than or equal to 30 mm. According to this configuration,a space is secured for allowing light with a large diameter which isemitted from the correcting optical system 13 to be orthogonallyincident on the holographic mirror 14. Accordingly, it is possible toguide the light of a wide angle of view range to the eyes of the viewer,and it is possible to view an image of a large size.

The correcting optical system 13 is disposed such that an angle θ2formed by the optical axis AX1 of the exit pupil G and an optical axisAX3 of the correcting optical system 13 is greater than or equal to 55°.According to this configuration, it is possible to dispose thecorrecting optical system 13 separated to the diagonal rear of theholographic mirror 14. Accordingly, it is possible for the viewer towear the display device 100 while still wearing ordinary (eyesightcorrective) eyeglasses.

The correcting optical system 13 is disposed outside of a range at whichan angle θ3 which is formed with the optical axis AX1 of the exit pupilG becomes 50°. Accordingly, other optical systems including thecorrecting optical system 13 are not disposed in a range within 50° inrelation to the optical axis AX1 of the exit pupil G. Accordingly, thevisual field of the viewer is sufficiently secured, and it is possibleto obtain a favorable see-through property.

In the HMD 300 of the present embodiment, since the mirror 16 whichreflects the light which is emitted from the light source optical system15 is provided in the image generating unit 11, the optical path betweenthe light source optical system 15 and the light scanning device 17 isturned back. Accordingly, it is possible to reduce the size of the imagegenerating unit 11, and such, it is possible to reduce the size of theentirety of the display device 100.

The holographic mirror 14 occupies the front side of the head portion Hof the viewer, and the side of the temporal region close to the ears ofthe viewer is occupied by the correcting optical system 13, the pupilmagnifying optical system 12, the light scanning device 17, and thelight source optical system 15. It is possible to sufficiently reducethe weight of the holographic mirror 14, whereas there is a limit to thereduction in weight of the other optical components. By positioning theoptical system other than the holographic mirror 14 at the temporalregion close to the ears of the viewer, the center of gravity of thedisplay device 100 approaches a position close to the ear. Therefore, aneffect may be obtained in that the display device 100 is stably andeasily held on the head portion even when the viewer wears the displaydevice 100 and moves the head portion, for example.

Since the pupil magnifying optical system 12 is positioned on theoptical path between the light scanning device 17 and the correctingoptical system 13, the pupil magnifying optical system 12 is configuredso as not to be positioned in front of the eyes of the viewer.Accordingly, it is possible to secure a favorable see-through propertywhile having a pupil magnifying function which is capable of reducingthe influence of eye movement and interpupillary distance fluctuation.Although the diameter of the light which is incident on the holographicmirror 14 is increased by the action of the pupil magnifying opticalsystem 12, even if the optical design of the holographic mirror 14 isoptimized, the aberration and distortion may not be completelycorrected, in particular, in a case in which the size of the image islarge, that is, the angle of view is large, the quality of the image maybe reduced. In this regard, since the HMD 300 according to the presentembodiment is provided with the correcting optical system 13, theaberration and distortion which are caused by the holographic mirror 14are corrected, and a high-quality image may be obtained. In this manner,according to the present embodiment, it is possible to provide an HMDwith which it is possible to visually recognize an image while securingthe see-through property regardless of eye movements and changes ininterpupillary distance, with which it is possible to display alarge-size image with high quality, and which is small, has excellentwearability, and has an excellent external appearance.

As described above, in the HMD 300 according to the present embodiment,by devising the orientation of the pupil magnifying optical system 12,the shape of a portion of the correcting lens which forms the correctingoptical system 13, and the like, the optical path of the entirety of theoptical system assumes a form which fits the face of the viewer. Sincean intermediate image is generated on the optical path between thecorrecting optical system 13 and the holographic mirror 14, the light onthe optical path is restricted, and there is little concern that thelight will interfere with the head portion H. As a result, it ispossible to cause the external shape of the display device 100 to fitthe face, and it is possible to render the external appearance of thedisplay device 100 slim.

The technical scope of the invention is not limited to the embodimentsdescribed above, and it is possible to add various modifications withoutdeparting from the gist of the invention.

For example, in the embodiment described above, a holographic mirror isused as the deflecting optical system; however, the deflecting opticalsystem is not limited to a holographic mirror, and a deflecting opticalsystem such as a Fresnel lens or a prism may be used, for example. Inaddition, appropriate changed may be made to the specific configurationsof the portions of the image display device without being limited to theembodiments described above.

REFERENCE SIGNS LIST

12 . . . pupil magnifying optical system, 13 . . . correcting opticalsystem, 14 . . . holographic mirror (deflecting optical system), 15 . .. light source optical system, 16 . . . mirror, 17 light scanningdevice, 25 . . . light source unit, 27 optical fiber, 28 . . .collimator lens.

The invention claimed is:
 1. An image display device comprising: a lightsource optical system emitting a light; a mirror reflecting the lightemitted from the light source optical system; a light scanning devicescanning in two-dimensionally the light reflected by the mirror; a pupilmagnifying optical system magnifying a beam diameter of the lightscanned by the light scanning device; a correcting optical systemcorrecting the light magnified by the pupil magnifying optical system;and a deflecting optical system deflecting the light corrected by thecorrecting optical system to a position of an exit pupil, and thedeflecting optical system transmitting a portion of external light,wherein a cross-sectional shape of the pupil magnifying optical systemis a trapezoid, and wherein the pupil magnifying optical system isdisposed in an orientation such that of two sides which are disposedparallel to each other in the trapezoid, a short side is positioned at aside which is close to the exit pupil, and a long side is positioned ata side which is distant from the exit pupil.
 2. The image display deviceaccording to claim 1, wherein the light scanning device is MEMS mirror.3. The image display device according to claim 1, wherein the correctingoptical system correcting a shape of the light magnified by the pupilmagnifying optical system.
 4. The image display device according toclaim 1, wherein the correcting optical system correcting a aberrationof the light magnified by the pupil magnifying optical system.
 5. Theimage display device according to claim 1, wherein the correctingoptical system correcting a distortion of the light magnified by thepupil magnifying optical system.
 6. The image display device accordingto claim 1, wherein the light having a intermediate image on an opticalpass between the correcting optical system and the deflecting opticalsystem.
 7. The image display device according to claim 1, wherein thedeflecting optical system is formed of a holographic mirror.
 8. Theimage display device according to claim 1, wherein the correctingoptical system is provided with a plurality of lenses, and wherein atleast one lens among the plurality of lenses has a wedge shape in whicha thicknesses on a side which is close to the exit pupil is thick, and athicknesses of a side which is distant from the exit pupil is thin. 9.The image display device according to claim 1, wherein the mirror isdisposed to be inclined such that an optical path of the light which isincident from the light source optical system and is reflected by themirror is positioned on a side which is separated from the exit pupil inrelation to an optical path of the light which is incident on themirror.
 10. The image display device according to claim 1, wherein thelight source optical system includes a light source unit, an opticalfiber which propagates the light from the light source unit, and acollimator lens onto which the light which is emitted from the opticalfiber is incident.
 11. An image display device comprising: a lightsource optical system emitting a light; a mirror reflecting the lightemitted from the light source optical system; a light scanning devicescanning in two-dimensionally the light reflected by the mirror; a pupilmagnifying optical system magnifying a beam diameter of the lightscanned by the light scanning device; a correcting optical systemcorrecting the light magnified by the pupil magnifying optical system;and a deflecting optical system deflecting the light corrected by thecorrecting optical system to a position of an exit pupil, and thedeflecting optical system transmitting a portion of external light,wherein the correcting optical system correcting a shape of the lightmagnified by the pupil magnifying optical system.
 12. The image displaydevice according to claim 11, wherein the light scanning device is MEMSmirror, and wherein the correcting optical system correcting adistortion of the light magnified by the pupil magnifying opticalsystem.
 13. The image display device according to claim 11, wherein thelight having a intermediate image on an optical pass between thecorrecting optical system and the deflecting optical system.
 14. Theimage display device according to claim 11, wherein the correctingoptical system is provided with a plurality of lenses, and wherein atleast one lens among the plurality of lenses has a wedge shape in whicha thicknesses on a side which is close to the exit pupil is thick, and athicknesses of a side which is distant from the exit pupil is thin. 15.The image display device according to claim 11, wherein the mirror isdisposed to be inclined such that an optical path of the light which isincident from the light source optical system and is reflected by themirror is positioned on a side which is separated from the exit pupil inrelation to an optical path of the light which is incident on themirror.
 16. The image display device according to claim 11, wherein thelight source optical system includes a light source unit, an opticalfiber which propagates the light from the light source unit, and acollimator lens onto which the light which is emitted from the opticalfiber is incident.
 17. An image display device comprising: a lightsource optical system emitting a light; a mirror reflecting the lightemitted from the light source optical system; a light scanning devicescanning in two-dimensionally the light reflected by the mirror; a pupilmagnifying optical system magnifying a beam diameter of the lightscanned by the light scanning device; a correcting optical systemcorrecting the light magnified by the pupil magnifying optical system;and a deflecting optical system deflecting the light corrected by thecorrecting optical system to a position of an exit pupil, and thedeflecting optical system transmitting a portion of external light,wherein the correcting optical system correcting a aberration of thelight magnified by the pupil magnifying optical system.
 18. The imagedisplay device according to claim 17, wherein the correcting opticalsystem is provided with a plurality of lenses, and wherein at least onelens among the plurality of lenses has a wedge shape in which athicknesses on a side which is close to the exit pupil is thick, and athicknesses of a side which is distant from the exit pupil is thin. 19.The image display device according to claim 17, wherein the mirror isdisposed to be inclined such that an optical path of the light which isincident from the light source optical system and is reflected by themirror is positioned on a side which is separated from the exit pupil inrelation to an optical path of the light which is incident on themirror.
 20. The image display device according to claim 17, wherein thelight source optical system includes a light source unit, an opticalfiber which propagates the light from the light source unit, and acollimator lens onto which the light which is emitted from the opticalfiber is incident.